Motor drive mechanism



' Feb. 22, 1938.- M. GARBELL MOTOR DRIVE MECHANISM Filed May 5, 1937 2 Sheets-Sheet 1 M. GARBELL Feb. 22,1938.

' MOTOR DRIVE MECHANISM 7 Filed Maya, 1957 2 Sheets-Sheet 2 Patented Feb. 22, 1938 Max Gal-bell, Chicago, 111., assignor to Victor Adding Machine Company, Chicago, Ilh, a corporation of Delaware Application May 3, 1-937, Serial No. 140,432

9 Claims.

This invention relates to a motor drive mechanism for adding machines or the like, and its purpose is to provide improved means for controlling the connections of the machines withtheir source of power.

The adding machine illustrated to which the mechanism is attached requires a single revolution or cycle for its normal operation in which the type bars are set up for making an impression thereof and are then restored to their normal positions during the cycle. Provision is also I made whereby a number of successive cycles may be had at the will of the operator.

' The chief objects of the present invention are the provision of mechanism adapted to be enioning means engageable at the end of the cycle 30 for absorbing the shock to the stopping action of the mechanism.

In the accompanying drawings embodying my invention, I show the mechanism as being attached to an adding machine, but do not wish 35 to be limited to the operation and action solely to an attachment while all of the features embodied in these improvements will be substantially .the same.

Figure l is a top plan view of an adding ma- 40 chine showing the casing of the machine broken away and my improved drive mechanism attached thereto.

Figure 2 isa longitudinal sectional view taken on the line 2-2 of Figure 1, showing the drive 45 mechanism in side elevation.

Figure 3 is an enlarged detail perspective view illustrating the tripping mechanism for effecting the starting and stopping of the mechanism.

Figure 4 is an enlarged side elevation of the 50 drive mechanism as viewed from the reverse side.

Figure 5 is a view similar to Figure 4 illustrating the drive mechanism in driving position and rotated approximately 190 degrees. I

Figure 6 is an enlarged cross-sectional view 55 taken substantially on the line 66 of Figure 4.

which extends from the side plate A of the ma- 30 Figure 7 is an enlarged detail perspective view of the drum co-acting with the mechanism and the adjustable means thereon; and

Figure 8 is an enlarged partial detail section view taken on the line 88 of Figure '5. 6 The mechanism includes a motor 10 which i has a shaft H to which a helical pinion i2 is secured. The pinion I2 is in mesh with a helical gear l3 carried on a driven shaft M which is supported. in a bracket it that is secured to the 10 motor Ill at IS. The driven shaft It extends outwardly of the bracket i5 and has a ratchet wheel I1 secured thereto. Outwardly of the ratchet wheel 21, the driven shaft it carries a drum l8 loosely pivoted thereon, and which drum 5 is held in position on the shaft M by means of a lock washer 59 secured in a recess in the shaft M; The drum i8 is arranged to be intermittently connected for turning movements with the ratchet wheel 1 l1 and this drum carries '20 a stud 2! on which a dog 22 is pivotally carried, and which dog is preferably in the shape of a bell-crank being provided with an engaging ear 23 and a leg 24. A tension spring 25 has one end secured to the dog 22 and its other end se- 25 cured to a pin 26 carried by the drum. l8, and this spring 25 serves to urge the engaging ear 23 of the dog 22 for engagement with the ratchet wheel I1. The dog 22 is normally retained out of engagement with the ratchet wheel l1 by a bell-crank arm 21 which is provided with an integral inwardly directed ear 28 that is normally in the path of the leg 24 of the dog 22. The bellcrank arm 21 is pivotally carried on a stud 29 chine and is controlled by a motor bar 30 for effecting the release of the dog 22 and of the drum IS. The ear 28 is normally in the path of the leg 24 of the dog 22 and a member 3| carried on the bell-crank arm normally preventing movement of the drum. The member 3! is slidably carried below the car 28 on the bell-crank arm 21 and is guided on a pair of pins 32 and 33 extending into elongated slots 34 and 35 provided in the member 3|. A spring 38 has one end secured to the pin 33 and its other end secured to a pin 31 fixed to the slide. This spring 36 normally retains the member 3| with an car 38 thereon readily. engageable by a shoulder 39 formed by a notched-out portion 40 on the periphery l8aof the drum l8.

- The bell-crank arm 21 has a link ll pivoted thereto at 42, and this link has its free end connected at 43 to :1. depending arm 44 fixed adturningmovements of the drum l8 to reciprocate I an inwardly directed arm 48 fixed thereto that is provided at its free end with an elongated slot opening 41 to receive a pin 48 carried on a depending portion 38a of the motor bar 38.; The link 4| is also provided with an upwardly directed portion Ha which carries an insulated strip 49, and this portion 4|a has one end of a tension spring 50 fixed thereto, and which spring has its other end fixed toa pin carried in the side plate A of the machine. This spring 5i? serves to urge the link it rearwardly or to the left as seen in Figure 1 to retain the bell-crank arm 277 positioned with its ear 28 in the path of the leg 24 of the dog 22 and the ear 33 of the member 3| in the path of the shoulder 39 of the drum. The insulated strip 49' is normally in the path of a contact point 52 which is carried on an insulated strip 53 supported on the side plate A of the machine, and this insulatedstrlp also carries a companion point 5 3. These points 52 and 56 each have a lead 55 and 5B, the lead 33 being connected directly to the motor, while the lead 55 extends to a source of power and a lead 55aconnects the source of power with the motor.

The drum it also carries a stud 51 to which one end of an operating link 58 is connected and which link has its other end connected at. 38 to an oscillatory arm 68 fixed to the actuating shaft 8| of the machine.

In the operation of the device when used to drive an adding machine, the desired keys of the machine are depressed, and to obtain the result, the motor bar 30 is then depressed. The depression of the motor bar 30 will rock the arm 46 downwardly and rock the shaft 45 and the depending arm 44 therewith which exerts a pull on the link 4| and effects the closing of the con tact points 52-44 to complete the circuit to the motor. This movement of the link 4| also rocks the bell-crank arm 21 on its stud 29 and carries the ear 28 thereof out of thepath' of the leg 24 of the dog 22 and the ear 38 of the member 3| out of the path of the shoulder 38 of the drum l8. When the leg 24 of the dog 22 is released, the spring 25 will rock the dog with the-ear 23 thereof into engagement with the ratchet wheel l1. It will be noted that the circuit to the motor is closed simultaneously with the engagement flof the dog with the ratchet wheel'so that the parts driven by the motor will be started rather smoothly without a jolt or jar. As the ear 23 engages the ratchet wheel l1, it willeflect the the link 58 and oscillate the arm 88 to operate the machine.

The movement of the bell-crank arm 21 to carry the ears 28 and 38 out of engagement with v the leg 24 of the dog 22 and out of engagement with the shoulder 38 of the drum l8 carries the ear 38 inwardly of the periphery |8a of the drum I8, and as the drum is rotated ,by'engagement of the dog 22 thereon with the ratchet wheel l'l, the ear 38 will then ride on the inner surface of the periphery |8a of the drum l8 and retain the bell-crank arm 21 in this moved position with the ear 28 out of engagement with the leg 24 of the dog to permit of its movement with the drum l8 for a cycle of operation. When at near the completion of the cycle, the notched-out portion 48 of the drum will have been carried past theear 38 of the member 3| and at which time this ear will drop through the notched-out portion, beingurged by the spring 58 operatively connected thereto through the link 4| and bellcrank arm 27', the movement or the bell-crank ments' of said member with arm 21 being limited by a pin'62 fixed in the side plate'A. As the ear 38 drops through the notched-out portion 48 in the periphery |8a of the drum '|8, the bell-era k arm 21 is then again in its normal position an the ear 28 thereof is again positioned in the path of the leg 24 of the dog 22 to be engaged thereby at the end of the cycle and carry the ear 23 of the dog out of engagement with the ratchet-wheel ll. This movement of the bell-crank arm 2li carries the link 4| therewith to break the circuit between the contact points Et-Sd, and the drum It will then coast until the shoulder 38 thereof engages the ear 3%. When the ear 38; is engaged by the shoulder 39, the member 3! wilhbe forced against the tension of its spring 38 to cushion the stopping action of the drum It. This member 3| will then holdthe drum against turning movements which in turn, holds the operating link 58 and osclllatory'arm 60 to prevent movement of the actuating shaft til.

The time at which the circuit is broken in each cycle of operation of the mechanism may be varied in accordance to the type of machine being driven thereby or in accordance with the speed it is desired to operate themachine. The

means for controlling the time at which the circult is broken comprises a member 53 which is preferably L-shaped and provided with a tongue 88 that has its inner edge undercut at 86a to slidably engage a coacting edge 85 provided in the notched-out portion 40. The top surface of the.

tongue 63 is arranged to fit flush with the inner surface of the periphery l8a of the drum and this member 63 is adjustable thereon by a bolt 66 carried in the member 63 and extending through a slot 81 in the drum.

The member 63 when adjusted toward the shoulder 39 provides for a relatively shortdisan electric motor for driving the same, and a member carried axially of the driven element, a spring-urged dog carried by said member and engageable with the driven element to drive the member therewith, control means comprising a rigid arm and a. resilient arm normally in the path of said dog and member respectively, and

manually manipulative meansior eflecting movement of said control means to simultaneously release the dog and member permitting said dog to be spring-urged for engagement with said the turning moveQ the driven element, the resilient arm or said control means servin driven element for causing to hold the rigid arm out of the path of said dogby sliding engagement with said member when moved by the-manipulative means and to form a cushioning stop for said member and retain the Y electric motor for driving the driven element, a

' circuit for the motor including a switch normally open in-the circuit, a member carried axially with said driven element, a dog carried by said memher for engagement with the driven element to drive said member with said driven element, a control member having a rigid arm and a resilient arm normally in the path of said dog and member respectively for holding them against movement and for simultaneously closing said switch to close the circuit, and manually manipulative means for eiiecting movement of the control member to close the switch in the circuit and for releasing said rigid and resilient arms from the dog and member whereby said dog will engage said driven element for causing said membar to be turned thereby.

3. A device of the character described, comprising in combination, a driven element and an electn'c motor therefor including a circuit, a member carried axially with said driven element, a dog carried by said member for engagement with the driven element, a control member comprising a rigid arm and a resilient arm normally in the path of said d% and member respectively for holding them against movement, manipulative means operatively connected with the control member to close the circuit and for simultaneously moving said control member to release the rigid and resilient arms thereof from said dog and member respectively whereby said dog will engage said driven element to drive the member therewith. l

4, A device of the character described, comprising in combination, a driven element having an electric motor for driving thesame, a member arranged for turning movements with said driven element and normally disengaged therefrom, a dog carried by said member and engageable with said driven element to drive the member therewith, a circuit for the motor including a switch, control means to close the circuit including a rigid arm and a resilient arm in the path of said dog and member respectively,and manually manipulative means for controlling the control means to simultaneously close the switch and to release the rigid and resilient arms from said dog and member permitting the engagement of the dog with said driven element to drive said member.

5. in combination, a machine, a motor for driving said machine, a driven element and a drum including engageable means carried by said drum forming a driving connection between said motor and said machine, means actuated by a common control for efiecting the engagement of said engageable means with said driven element and to connect the motor with a source of power to drive said driven element and drum, said means including a rigid arm and a resilient arm normally in the path of said engageable means and drum respectively whereby they are released by movement of said common control, said resilient am being arranged for sliding engagement with the drum when released therefrom and for cushioning the stopping shock theretoupon a completion of electric motor and a circuit' therefor, a member arranged for turning movements with said driven element, a dog carried by said member and engageable with said driven element to drive the.

member therewith, means operable to close the circuit and having a rigid arm and a resilient arm normally in the path of said dog and member respectively, manually manipulative means for controlling said operable means to simultaneously close the switch and to release said rigid and resilient arms from said dog and member whereby said member will be driven by said driven element, and means on said member engaging the resilient arm and retaining the operable means for nearly a cycle of operation and to then release the same to break the circuit and to release said dog and stop the drum at the end of the cycle.

. l. In combination, a machine, a motor for driving said machine, a driven element, a drum,

having an opening therein including engageable means carried by the drum forming a driving connection with the driven element between said motor and said machine, means'including a rockable member actuated by a common control for efi'ecting the engagement of said engageable means with said driven element and to connect the motor with a source or power to drive said -driven element and drum, the opening in said drum permitting of the movement of said rockable member, and means on said drum retaining the said means and'rockable member in actuated position for nearly a cycle of operation when moved by said common control and the opening in said drum permitting of the release of said means and rockable member to disconnect the source of power and the engageable means from said driven element.

8. The combination of claim 7 hereof in which there is an adjustable member carried by said drum and coacting with the opening therein for 1 varying the size of said opening whereby the source of power may be disconnected at predetermined positions of rotation of said drum.

9. The combination of claim '7 hereof in which there are resilient means carried by said means and coacting with said drum and serving to retain the source of power connected during the turning movements of the drum with the driven element and to pass through said opening in the drum to cut oil the source of power and to position the said means into the path of the engageable means to disengage the same from said driven element, said resilient means forming means to stop said drum and to cushion the same during the stop.

MAX GARBELL 

